Based on the fact that there have been several mass grave burials, found in various parts of Liverpool,such as the school site in Lower Breck rd.(where over a thousand bodies,mainly young people,were intered,then later,covered over by the White City dogtrack!!!) It doesn't seem improbable that the Old Swan site was something like a cholera pit? As for moving bodies from defunct graveyards,Grant gardens, which was the site of the Necropolis,was closed about 1910, and turned into a park.During trial excavations a couple of years ago,for Merseytram, on this site,......guess what, they found human remains! So I'd conclude from that,only the families/relatives of the deceased who were wealthy,or bothered enough to pay for removal,did so, and the rest were played footie on for years,unknown to the players, etc!